2-ply Cotton in jcrews secret wash (they don’t make shirts like this anymore, great quality and timeless style). All my shirts have never been put in the dryer. Just hang dry only. Size is medium slim. **NOTE: all my Jcrew items are authentic retail and NOT factory/outlet/mercantile unless stated. So rest assured the quality is high for pricepoint — you can tell a factory/outlet/mercantile item by seeing 2 dots in the label**